JP2019073308A - Sleeve packaging method using stretch film, stretch film for sleeve packaging and manufacturing method of sleeve packaging body - Google Patents

Abstract

To provide a packaging method which is a method for mechanically packaging an object to be packaged such as books and boxed articles and an object to be packaged in which a plurality of these things are stacked, which does not require a heating device such as a shrink tunnel, and which can prevent contamination, breakage and the like of the object to be packaged.SOLUTION: A method of sleeve packaging an object to be packaged by using a stretch film 2 wider than an object 3 to be packaged sequentially includes: a covering step of covering the object to be packaged by the stretch film so that both side edge parts 2a and 2b of the stretch film protrude from both sides of the object to be packaged; a stretching step of stretching the stretch film and folding both side edge parts of the stretch film to both side surface sides of the object to be packaged; and a molding step of fusing and cutting the stretch film and forming the same in a cylinder shape.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a method of sleeve-packing an article using a stretch film, a stretch film used in the method, and a method of manufacturing a sleeve package using the method. The present invention can be particularly suitably used when packaging substantially rectangular parallelepiped articles such as books such as comic books and books, boxed products, etc., or when collecting and packaging a plurality of them.

Books such as comic books and books are often packaged with a synthetic resin film for the purpose of preventing reading, preventing contamination and breakage, and the like. Patent Document 1 is an invention relating to a packaging bag which can extract a sales slip sandwiched between books without opening the bag. If the book is packed in a bag so as not to open, there is a problem that the slip for checking sales can not be taken out. Therefore, Patent Document 1 is characterized in that the packaging bag is provided with a hole through which the sales slip can be extracted.
However, when books are packaged using a prefabricated packaging bag, the operation of inserting the books into the bag is difficult to mechanize, so the mouth of the packaging bag is usually opened manually, and the book is placed in the bag Need to be introduced.

Patent Document 2 is an invention related to a packaging apparatus for shrink-packing books and the like. Using this device, the work of inserting books into the packaging bag, which has conventionally been performed manually, can be omitted and automated. Specifically, it is possible to automatically shrink and pack by simply inserting books into the device through the insertion slot.
By the way, after shrink-wrapping, after wrapping books in a shrink film, it is necessary to pass this through a heating device called a shrink tunnel to shrink the shrink film. However, since books are paper products, it is not desirable to install a heating device in a bookstore, and the emergence of a packaging method that does not require a heating device is desired.

Patent Document 3 relates to a stretch film. The purpose is to delete the amount of carbon dioxide emitted when incinerated and discarded, and is characterized by containing a specific amount of carbon dioxide absorbing substance.
Patent Document 3 discloses that a book or the like can be packaged using the film. However, no specific method for packaging books using the film is disclosed.

  Patent Document 4 is an invention relating to a method of sleeve packaging using a stretch film which is wider than a package and has self-adhesiveness, and an apparatus for sleeve packaging. According to the packaging method disclosed in Patent Document 4, after a stretch film is wound and wrapped around at least two or more layers around a package, the film is cut and the films are adhered to each other by self-shrinkage of the stretch film. At the same time, the film surplus portion protruding from the end of the article to be packed is in close contact in a sleeve shape from the end edge to the end face.

  The packaging method requires many packaging materials in order to wrap the film at least twice or more. In addition, since the stretch film used in the packaging method has self-adhesiveness, it has been difficult to wrap the stretch film on a package while stretching it, or to stretch the film after wrapping it on a package. In Patent Document 4, a stretch film is stretched 100% to 250% in advance by a stretch roller, and then the film is wound around a package. Therefore, the apparatus for covering a package with a film has become very special.

Japanese Utility Model Application Publication No. 7-11353 Utility model registration No. 3067592 gazette JP, 2016-11401, A JP 10-305807 A

  The present invention is a method capable of mechanically packaging an article such as a book or a boxed product, or an article in which a plurality of these are stacked, and does not require a heating device such as a shrink tunnel, An object of the present invention is to provide a packaging method capable of preventing contamination, breakage and the like of a package. Another object of the present invention is to provide a stretch film used in the packaging method and a package using the packaging method.

The present inventors examined the method of band-wrapping a to-be-packaged article using a stretch film first as a means for solving the said subject. As shown in FIG. 6 (A), the band-wrapping package uses a synthetic resin film 2 'whose width is narrower than the width X of the packaged product 3' and covers the periphery of the packaged product 3 'in a band shape. It is a packing method. At this time, the right side 3a 'and the left side 3b' of the package 3 'are not covered with the synthetic resin film 2'.
It was found that when the books and the boxed goods were packed using the stretch film by the band wrap packaging, the band wrap packaging could not sufficiently prevent the contamination and breakage of the books. In these packages, it is the corners that are most susceptible to damage, and in banded packaging the corners can not be protected by a film.

Then, the present inventors examined the method of sleeve-packing a to-be-packaged thing using a stretch film. As shown in FIG. 6 (B), the sleeve packaging is a packaging method for covering the article to be packaged 3 'using a synthetic resin film 2' having a wider width than the width X of the to-be-packaged article 3 '. According to the sleeve packaging, the front 31 ', the back 32', the top 33 ', and the bottom 34' of the package are covered by the synthetic resin film 3 ', and the periphery of the right side 3a' and the left side 3b 'of the package Also covered.
In general sleeve packaging, a shrink film is used as a synthetic resin film 3 '. This is for the side edges 2a 'and 2b' of the film to be in close contact with the left and right side surfaces 3a 'and 3b' of the package. When the side edges 2a 'and 2b' of the film are lifted from the left and right side surfaces 3a 'and 3b' of the package, the appearance of the package becomes poor, and the film 2 'is easily torn from the lifted portion.
When sleeve packaging using a stretch film, prior to forming the stretch film into a cylindrical shape, if the film is sufficiently stretched, the side edges of the film are on the left and right sides of the package. It has been found that it bends, resulting in the present invention.

That is, according to the present invention, as a means for solving the above problems, in a method of sleeve packaging a package using a stretch film wider than the package, both side edges of the stretch film are both sides of the package. Covering the package with the stretch film so as to protrude from the side; and stretching the stretch film so as to bend the side edges of the stretch film to both sides of the package; A sleeve packaging method using a stretch film is provided, which comprises sequentially forming a step of fusing and cutting the stretch film and forming it into a cylindrical shape.
Further, in the method of sleeving the package using the stretch film wider than the package, the package is made of the stretch film so that the side edges of the stretch film protrude from the sides of the package. A stretch coating step of stretching the stretch film so as to cover an object and bending the side edges of the stretch film to both sides of the package, and fusing and cutting the stretch film to form a cylindrical shape There is provided a sleeve packaging method using a stretch film characterized by sequentially comprising a forming step.
Furthermore, when stretching the stretch film in the stretching step or the stretch coating step, the sleeve packaging method using the stretch film is characterized in that the side edges of the stretch film are stretched more than the central portion of the stretch film. Provided.
Further, according to the present invention, there is provided a sleeve packaging method using the stretch film, wherein the material to be packaged is a book.

The present invention also provides a stretch film for use in a sleeve packaging method using the stretch film, wherein a yield point is not observed when the film is stretched 50% in the flow direction. .
Also, the sleeve packaging stretch film is provided, wherein the 50% modulus in the film flow direction is 3N / 25.4 mm to 30 N / 25.4 mm.
Further, the present invention provides a method for producing a sleeve package comprising a stretch film and a package, wherein the method is used for the sleeve package.

According to the packaging method of the present invention, it is possible to cover books such as comic books and books, boxed products, etc. with a stretch film including corner parts. Therefore, it is possible to effectively suppress the contamination, breakage and the like of the package without requiring a heating device such as a shrink tunnel. Further, according to the present invention, since the side edge of the stretch film is bent to the side of the package, the appearance of the obtained package is good, and the problem of the film being broken from the side edge hardly occurs.
Further, when the packaging method of the present invention is used for stacking and packaging a plurality of articles together, the side edges of the stretch film are bent to the side of the package, so that the individual articles are prevented from shifting left and right. It is possible to maintain cohesion.
By adopting the packaging method of the present invention as the package is a book, browsing and the like can be prevented. In addition, since the sleeve packaging is opened at the central portions of the left and right side faces, it is possible to extract the sales slip sandwiched between the books and the like without drilling the film.

In particular, when the film is stretched 50% (1.5 times the length of the base) in the flow direction (MD: direction in which the film travels) as a stretch film, no yield point is observed The use of a film makes the resulting package look particularly good.
In addition, when the 50% modulus in the flow direction (MD) of the stretch film used in the present invention is 3N / 25.4 mm to 30 N / 25.4 mm, the package can be tightly packed without bending. .

It is the schematic for demonstrating the packaging method of this invention. It is the schematic for demonstrating the packaging method of this invention. It is a schematic perspective view of the sleeve package by the manufacturing method of this invention. It is a schematic diagram for describing a specific embodiment of the present invention. It is a schematic diagram for describing a specific embodiment of the present invention. It is a schematic diagram for explaining a strapping package (A) and a sleeve packaging (B).

Hereinafter, the present invention will be described in detail based on the drawings. In the drawings, the same reference numerals denote the same or equivalent components. Further, the present invention is not limited to these forms, and various forms can be taken.
[Sleeve packing method]
The sleeve packaging method using the stretch film of the present invention comprises (1) a coating step, an extending step, and a forming step in order, or (2) an extending coating step and a forming step in order.

[(1) Packaging method including coating step, stretching step, molding step in order]
Among the sleeve packaging methods of the present invention, a packaging method including a coating step, an extending step, and a forming step will be described based on FIG.
The coating step is a step of covering the package with a stretch film. Specifically, as shown in FIG. 1 (A), the film is folded at about 180 °, and the package is placed between the folded films. Hereinafter, the direction (direction W in FIG. 1) perpendicular to the side to be bent of the film is referred to as “width direction”, and the direction parallel to the side to be bent (direction L in FIG. 1) is hereinafter referred to as “length direction”. .
In the covering step, the package film 3 is covered with the stretch film 2 so that the side edges 2a and 2b parallel to the longitudinal direction of the stretch film 2 protrude from the side 3c of the package product 3. At this time, the length direction L of the stretch film 2 and the side 3 c of the package 3 are made substantially parallel. In FIG. 1, the side 3 c substantially parallel to the length direction L of the stretch film is the short side of the package, but the side 3 c may be the long side of the package. Which side is to be the side 3c may be appropriately determined in accordance with the size of the package, the film width, the packaging machine, and the like.

Next, a stretching step is performed. In the stretching step, as shown in FIG. 1 (B), the side edges 2a and 2b of the stretch film 2 are stretched along the side surface 3a of the package 3 while stretching the stretch film 2 in the film length direction (arrow direction). Bend it to the 3b side. In general, the side edges 2a and 2b of the stretch film 2 are naturally bent to the side surfaces 3a and 3b of the package 3 when the film is stretched by about 1.1 to 1.5 times the length before the stretching. When the side edges 2a and 2b of the stretch film are stretched to be larger than the central portion 2c in the width direction, the side edges 2a and 2b easily bend toward the package 3 side.
As long as the side edges 2a and 2b of the stretch film 2 are bent toward the side surfaces 3a and 3b of the package 3 at least in part, there is no problem even if some unbent portions remain, but the side edge 2a And 50% or more of the area of 2b is desirably bent, and in particular, 70% or more, and further preferably 90% or more. The more the bent part, the more effectively the package can be protected and the better the appearance of the package.

  Then, a molding process is performed. The forming step is a step of fusing and cutting the stretch film, and forming it into a cylindrical shape as shown in FIG. 1 (C). When the side edges 2a and 2b are bent toward the side surfaces 3a and 3b of the package 3 in the stretching step, the stretch film 2 is formed into a cylindrical shape while maintaining the bent state. Although the method of fusing and cutting the film 2 is not particularly limited, it is desirable to use a fused seal in consideration of the packaging finish.

[(2) Packaging method including the stretch coating step and the molding step in order]
Among the sleeve packaging methods of the present invention, a packaging method including a stretch coating step and a forming step in order will be described based on FIG. In FIG. 1, after the package 3 is covered with the stretch film 2 (coating step), the film 2 is stretched (stretching step), while the stretch film 2 is stretched, the package 2 is covered with the film 2. Also good (stretch coating process).
The stretch coating step is a step of covering the periphery of the package 3 with the film 2 while stretching the stretch film 2 in the lengthwise direction, as shown in FIG. 2 (A). The method of arranging the film around the package 3 while stretching the film is not particularly limited, but it is desirable to temporarily fix the package 3 so that the position of the package 3 does not move. When the side edges 2a and 2b of the stretch film are stretched larger than the central portion 2c in the width direction, the side edges 2a and 2b are easily bent to the side of the package 3 in the same manner as the stretching step described above.
The forming step (FIG. 2 (B)) may be performed by the same method as the forming step of the packaging method including the above-described (1) covering step, stretching step, and forming step in order.

[Sleeve package]
FIG. 3 is a schematic perspective view of the sleeve package 1 manufactured by the above-described sleeve packaging method. The sleeve package 1 obtained by the present invention comprises a stretch film 2 and a package 3. When the width of the stretch film 2 is W (not shown) and the width of the package 3 is X, W> X. If the film width W is equal to or less than the package width X, the package 3 can not be sleeve-wrapped. Further, in order to reliably protect the corner 3d of the package 3, the film width W is preferably X + 5 mm or more, and particularly preferably X + 10 mm or more.
When the height of the package 3 is Y, the film width W is preferably (X + Y) or less. When the film width W exceeds X + Y, the stretch film 2 overlaps on the right side 3a and / or the left side 3b of the package, and the appearance is deteriorated. In the case where the package 3 is a book, the film width W is desirably equal to or less than (X + Y-5 mm), and particularly desirably equal to or less than (X + Y-10 mm), in view of sales slip extraction work.

[Stretch film]
The stretch film used in the sleeve packaging method of the present invention stretches the film 50% in the film flow direction according to a tensile test described later (stretches until the distance between chucks becomes 1.5 times the base length) It is desirable that the film be such that no yield point is observed. The film in which the yield point is observed when stretched by 50% may cause irreversible deformation of the stretch film in the above-mentioned stretching step and stretch coating step. Preferably, no yield point is observed even when 100% (the distance between chucks is 2.0 times the base length) is stretched.

  The stretch film used in the present invention preferably has a Young's modulus (tensile modulus) of 200 MPa or less, which is obtained from the tangent of the rising portion of the stress-strain curve determined by a tensile test described later. It is desirable that the pressure be 150 MPa or less, in particular 100 MPa or less. A stretch film having a high Young's modulus is difficult to stretch, and the side edge portion of the stretch film is not easily bent to the side surface of the package in the stretching step and the stretch coating step described above. When the Young's modulus is less than 50 MPa, particularly less than 10 MPa, it becomes difficult to tightly package the package with a stretch film.

  Further, the stretch film of the present invention has a 50% modulus (stress when the distance between chucks is expanded to 1.5 times the base length) determined by a tensile test to be described later in the film flow direction is 3N / 25.4 mm As described above, it is preferable that the diameter is 5N / 25.4 mm or more, and more preferably 7N / 25.4 mm or more. If the 50% modulus is too low, it will be difficult for the stretch film to make intimate contact with the surface of the package. If the 50% modulus of the stretch film is too high, the package may be distorted by the stretch film, so the value is 30N / 25.4 mm or less, particularly 20N / 25.4 mm or less, and further 15N / 25. It is desirable that it is 4 mm or less. In the case where the package is a book, it is preferable that the 50% modulus of the film is 10 N / 25.4 mm or less because the book is easily bent by the stress of the film.

(Tensile test)
The method of a tensile test is demonstrated. First, a test strip type 4 defined in JIS K7127 is prepared. At this time, the flow direction of the film is made to be the length direction of the test piece. Next, in accordance with JIS K7161: 2014, a tensile test is performed at a temperature of 23 ± 2 ° C. and a relative humidity of 50 ± 5% at a marked line distance of 40 mm, a distance between grippers of 40 mm, and a tensile speed of 500 mm / min. In the example of the present invention, autograph AGS-X500N manufactured by Shimadzu Corporation was used for the tensile test.

In order to bring the yield point, the Young's modulus, and the 50% modulus value into the above-mentioned ranges, for example, a film may be formed from polyurethane. Also, polyethylene resins such as low density polyethylene, medium density polyethylene, ultra low density polyethylene, linear low density polyethylene, linear ultra low density polyethylene, ethylene-vinyl acetate copolymer, ethylene-vinyl alcohol copolymer Select one or more from α) and use it as a main component, one or more from thermoplastic elastomers (β) such as polystyrene based elastomers, polyolefin based elastomers, polyurethane based elastomers, polyester based elastomers and polyamide based elastomers It is good to manufacture a stretch film from the resin composition which makes it a selection and makes this a subsidiary component. In addition, in consideration of film forming property and stretchability of the film, it is desirable to form a stretch film from a resin composition which is mainly composed of linear low density polyethylene and to which an olefin-based elastomer is added as an accessory component. . In addition, when a block copolymer of ethylene and an α-olefin, which is excellent in heat resistance, is used as the olefin elastomer, the stability of the seal portion of the obtained film is improved.
Although the blend ratio of polyethylene-based resin (α) and thermoplastic elastomer (β) is not particularly limited, for example, polyethylene-based resin (α): thermoplastic elastomer (β) = 51 to 95% by weight: 49 to 5 It is desirable that it is in weight percent, and particularly about 70 to 90 weight percent: about 30 to 10 weight percent.

Moreover, as for the stretch film used for this invention, it is desirable that the static friction coefficients of both surfaces are 0.1-0.9. When the static friction coefficient exceeds 0.9, the stretch film may be in close contact with the package, the conveyance machine, or the like in the above-described stretch coating process, and the stretch film may not be uniformly stretched. When the coefficient of static friction is less than 0.1, it is difficult to stack and store sleeve-wrapped packages. In addition, as for the inner surface (to-be-packaged material side) of a stretch film, it is desirable that a static friction coefficient is 0.1-0.4, and an outer surface is about 0.3-0.7.
In order to lower the static friction coefficient without impairing the stretchability of the film, the stretch film is multilayered to make the main components of both outer layers relatively high density polyethylene resin, and the other resin layers relatively density It is preferable to use a low polyethylene resin. For example, the film has a three-layer structure, and both outer layers are molded from a resin composition containing linear low density polyethylene having a density of 910 to 925 kg / m ³ as a main component, and the intermediate layer is a straight of density 880 to 909 kg / m ³ It is good to shape | mold from the resin composition which has chain-like ultra-low density polyethylene as a main component.

Next, specific embodiments of the present invention will be described based on the drawings. 4 and 5 are diagrams sequentially showing the steps of the embodiment of the present packaging method.
The stretch film 2 has a thickness of 40 μm and is formed from a resin composition containing linear low density polyethylene as a main component and an olefin elastomer which is a block copolymer of ethylene and α-olefin as a secondary component. We adopt stretch film (width 195mm). The yield point of the film was not observed at 50% stretching, and was not observed at 100% stretching. The Young's modulus is 80 MPa and the 50% modulus is 9.3 N / 25.4 mm.
In addition, a comic book with a width of 182 mm, a length of 128 mm, and a height of 20 mm is adopted as a material to be packaged.

The sleeve packaging method illustrated in FIG. 4 will be described.
First, the package 3 (comic book) is placed on the belt conveyor 5. At this time, the short side direction of the package 3 is made substantially parallel to the moving direction of the belt conveyor 5. Next, the raw fabric 4 of the stretch film 2 is disposed above and below the package 3 respectively, and the tip of the stretch film 2 fed out from above and the tip of the stretch film 2 fed out from below are sealed by melting. And connect (Fig. 4 (A)). Furthermore, the belt conveyor 5 is rotated to push the package 3 between the stretch films 2 (FIG. 4 (B)). At this time, the original fabric 4 is set to be fed out with a low tension. When the stretch film 2 substantially covers the package 3, the coating process is completed.

  Next, the raw material 4 is fixed so as not to rotate, and the package 3 is further moved. At this time, the lower rear (the raw fabric 4 side) of the package 3 is pushed using the claws 6 so that the package 3 is not pulled back by the stress of the stretch film 2 (FIG. 4 (C)). When the side edge 2a (2b) of the stretch film 2 is bent toward the package 3 side, the stretch coating process is completed. At this time, if the side edge 2a (2b) of the stretch film is stretched more than the widthwise central portion of the stretch film by picking the side edge 2a (2b) with a jig or arranging a crown roll, etc. The side edge 2a (2b) is easily bent to the side of the package 3.

Finally, the stretch film 2 is fused and sealed by the heat seal bar 7a and the holder 7b, whereby the film is formed into a cylindrical shape, and the forming process is completed (FIG. 4 (D)). In addition, when the stretch film 2 is expanded and contracted at the time of melt-cut sealing, since a stress is applied to the sealing portion, a sealing failure is easily generated. In order to perform a stable sealing portion, it is preferable to suppress the expansion and contraction of the stretch film 2 by suppressing the front and back of the portion of the stretch film 2 to be melted and sealed by the holding tool 8 prior to the fusion cutting seal.
In the sleeve package obtained by the embodiment, since the stretch film covers all corners of the comic book to be packaged, the comic book can be protected efficiently. In addition, since the side edges of the stretch film are bent to the side of the comic book, the appearance is also good.

Next, the sleeve packaging method illustrated in FIG. 5 will be described.
First, the package 3 (comic book) is placed on the belt conveyor 5. At this time, the short side direction of the comic book is made substantially parallel to the moving direction of the belt conveyor 5. Next, the raw fabric 4 of the stretch film 2 is disposed above and below the package 3 respectively, and the tip of the stretch film 2 fed from above is connected with the tip of the stretch film 2 fed from below ( FIG. 5 (A). Next, the package 3 is pushed between the stretch films 2 by the pressure 9 (FIG. 5 (B)). At this time, the original fabric 4 is set to be drawn out with high tension so that the stretch film 2 is drawn out while being stretched. When the side edge 2a (2b) of the stretch film 2 is bent toward the package 3 side, the stretch coating process of the present invention is completed. Similar to the embodiment illustrated in FIG. 4, when the side edge 2 a (2 b) of the stretch film is stretched to be larger than the widthwise central portion of the stretch film, the side edge 2 a (2 b) is on the side of the package 3 It is easy to bend.

  Next, the stretch film 2 is pinched by the pressing tool 8 while the pressure 9 is being retracted, so that the stretch film 2 does not return to the original state (non-stretched state) (FIG. 5C). Finally, the film 2 is fused and sealed by the heat seal bar 7a and the holder 7b and formed into a cylindrical shape, whereby the packaging method of the present invention is completed (FIG. 5 (D)).

DESCRIPTION OF SYMBOLS 1 Package 2 Stretch film 2 'Synthetic resin film 2a, 2a' Right side edge 2b, 2b 'Left side edge 3, 3' Package 3a, 3a 'Right side 3b, 3b' Left side 3c Side 3d corner 31 'front 32' back 33 'top 34' bottom 4 original fabric 5 belt conveyor 6 claw 7a heat seal bar 7b support 8 pressure tool 9 pressure

Claims (7)

In a method of sleeving a package with a stretch film wider than the package,
Covering the package with the stretch film so that both side edges of the stretch film protrude from both sides of the package;
Stretching the stretch film so as to bend the side edges of the stretch film to both sides of the package;
Forming a cylindrical film by fusing and cutting the stretch film;
And a sleeve packaging method using a stretch film. In a method of sleeving a package with a stretch film wider than the package,
The stretch film is stretched while covering the package with the stretch film so that the side edges of the stretch film protrude from the sides of the package, and the side edges of the stretch film are the package. Stretch coating step of bending on both sides of the
Forming a cylindrical film by fusing and cutting the stretch film;
And a sleeve packaging method using a stretch film.   The stretch film according to claim 1 or 2, wherein when stretching the stretch film in the stretching step or the stretch coating step, the side edges of the stretch film are stretched to be larger than the central portion of the stretch film. Sleeve packaging method.   The sleeve packaging method using a stretch film according to any one of claims 1 to 3, wherein the material to be packaged is a book. A stretch film used in a sleeve packaging method using a stretch film according to any one of claims 1 to 4, which is a stretch film,
A stretch film for sleeve packaging characterized in that no yield point is observed when the film is stretched 50% in the machine direction.   6. The stretch film for sleeve packaging according to claim 5, wherein the 50% modulus in the film flow direction is 3N / 25.4 mm to 30 N / 25.4 mm. A method for producing a sleeve package comprising a stretch film and a package, wherein the method for producing a sleeve according to any one of claims 1 to 4 is used.

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